Improvement in chills for mold-boards



G. K. SMITH.

CHILLS FOR MOLD BOARDS.

No.175,Z61. Patented March 28,1876.

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WITNESSES I JV V'EJV' TOR Zen :1 6 0o I By fi,

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MFEYERS. PHOTO-LITNOGRAFHER. WASHINGTON, u c

UNITED STATES PA ENT QFFIG'E.

GEoRGE K. SMITH, or wATE Loo, IOWA, ASSIGNOR OF ONE-HALF HIS RIGHT TOGEoRGE W. MILLER, OF SAME PLAGE.

IMPROVEMENT lN CHILLS FOR MOLD-BOARDS.

Specification forming part of Letters Patent No. 175,21, dated March 28,1876; application filed October 19, 1875.

To all whom it may concern Be it known that I, GEORGE K. SMITH, ofWaterloo, in the county of Black Hawk and State of Iowa, have invented acertain new and useful Improvement in a Perforated Chill- Plate or Formfor Chilling Cast Mold-Boards for Plows; and the following is a full,clear, and exact description of the same, reference being had to theaccompanying drawings, making a part of this specification, in which-Figure 1 represents a top view of the flask for casting mold-boards,showing one portion of the cope, with the upper side of theperforatedchill-plate, the other portion of the cope filled withmolding-sand, in which is the sprue or gate for pouring the meltedmetal. Fig. 2 shows the drag or lower part of the flask, with themold-board pattern in position, as molded, before being removed forputting on the perforated chill-plate and cope. Fig. 3 is the form orchill-plate, showing the under side that comes in contact with thecasting, in which are the many small perforations for the escape of theair and gas. Fig. 4 shows the under side of sand-cope and sprue, or gatefor pouring and conveying molten metal to the mold.

My invention consists inproviding a series of very small holes orperforations through the chill-plate or block, against which the moltenmetal comes in contact, for chilling the surface, so as to give vent forthe air and gas to escape while the mold is filling, thereby effectuallysecuring a smooth hard surface, free from wrinkles and indentations.

To enable others to make and use my invention, I will describe it morein detail, re-- ferring to the several figures in the drawings, and tothe letters marked thereon.

I make the under portion of the flask A (usually called the drag byiron-founders,) of a suitable size to receive and mold the patternB,there being provided a suitablyformed molding-board, on which to placethe pattern B and fill the drag A when the flask is turned upside downand the moldingboard removed. The portion of the flask containing theperforated chill-plate or form 0 is then placed on the drag A, over thepattern B, and also the other portion of the flask D is put in positionon the drag and filled with sand, the gate a, and sprue b I) being madein this portion of the flask, they both together forming the cope orupper portion of the mold. The form or plate 0, that makes thechill-block, is made thick enough to keep it from warping, and shaped toconform to the face of the pattern B, and is made perfectly smooth wherethe melted iron comes in contact with it, and is perforated with seriesof rows of very small holes, 0 c c, not larger than an ordinary pin orsmall knitting-needle on the smooth face 0, but may be larger on theother or top side, the object being to let the air and gas escaperapidly from the mold, while the molten metal is being poured in, theperforations being so small that the metal will not run into them, butchill perfectly smooth as the face of the chill-block.

It is well known to foundrymen that in casting on a chill the hardsurface will generally be very uneven, wrinkled, wavy, and oftenindentations caused by the air and gas, sufiiciently deep to spoil thecastings, and this is especially the case in casting so broad a surfacein so thin a plate as a mold-board for a plow, for in the ordinaryprocess the melted metal, coming in contact with the chill-block,generates agas on the cold iron, which, together with the air in themold, has no way of escape, and causes the difficulty.

By my invention, perforating the chill-plate or block 0, the aforesaiddifliculties are entirely remedied, and the chilled face of everymold-board will be as smooth and perfect as any casting can be made;and, furthermore, by my improved method of having the chill-- block inthe cope, not using any sand above the chill-block, and a separate copefor forming the gateway and sprue, more than twice the amount of chilledwork can be molded or cast in a given time than by the ordinary process,as one chill-block cope may be used for any number of the molded flasks,by spongingit, and removing it to another immediately after the metal ispoured.

What I claim is- The form or chill-block 0, the same being my name tothe above specification for a-ppliperforated with many very fine orsmall holes cation for Letters Patent. over the entire surface, of theface and size of the pattern of the mold-board to be cast on GEORGE. K.SMITH. the chill, substantially as herein shown and Witnesses described,for the purpose set forth. MANSFIELD M. STUBGEON,

In testimony whereof I hereunto subscribe EDWARD GEORGE.

